In 1660, English scientist Robert Hooke created Hooke's Law. Hooke realized that object deformation, even small deformations or directly proportional to the force or load causing the deformation. In other words, the deformation of steel is linear.
Because the deformation of steel is linear, and because steel has a memory, the physical characteristics of steel were perfect to be the basis of a beam wrench.
Walter P. Chrysler was watching his assembly line workers torque heads on to the aluminum blocks. It was 1924.
To fully understand the genius of Walter P. Chrysler, aluminum was still relatively new. Aluminum wasn't really fully extracted and processed until 1886. Aluminum blocks are common today. But back in 1924, they were cutting edge technology.
The problem was that the engines were blowing up. Despite being a phenomenal engineer, Chrysler couldn't diagnose the root cause until he watched two workers tightening the head bolts.